July-August - Air Defense Artillery School

"(!fCe forward down the length of the box and onto a
11.2" wide by 13" high translucent screen which is in-
.;ailed in the front of the box. The screen is made of good
!l3litytracing paper. A full top is not needed, but it is well
. co\:erthe rear half of the box to protect the mirror from
I ustand dirt.
OPERATIOX
To use the Shadowgraph, a model plane is suspended
'ithin the box directly behind the screen. \\Then viewed
from a few feet away, the image cast on the screen very
:bse1y reproduces the appearance of a plane against a gray-
•lIuesky. If the model is suspended from a puppet stick by
0\ VGRAPH FOR RECOGNITION THAINING
threads attached to wing tips and vertical fin, the movements
of the plane can be controlled accurately and with
a little practice the operator will be able to maneuver the
model realistically.
The regular metal or plastic scale airplane models can
be used or excellent models can be made from cardboard. A
plan for these cardboard models, reproduced from Aircraft
Recognition, February, 1943, is shown. Similar plans for
other planes can be prepared quite readily. These paper
models have been found more convenient to use than the
metal ones as they can be more easily controlled and can
be built to one uniform size.
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